At 18.24 hours on 16 March 1942 the unescorted Stangarth (Master William Ewart Herbert) on her maiden voyage was hit by one torpedo from U-504, exploded and sank immediately about 300 miles north of San Juan, Puerto Rico. The master, 39 crew members and six gunners were lost. The U-boat examined the wreckage and discovered that the vessel was carrying ammunition, trucks and aircraft parts destined for Bombay.

Revisions

Reassessment by Eric Zimmerman in 2000:For several years it was thought that Stangarth had been sunk by an attack of the Italian submarine Morosini on 12 March, but she could not possibly have reached the reported attack position. It is more likely that she was lost to an attack carried out by U-504 on 16 March and that Manaqui was the ship sunk by the Italian submarine.